Layered curvilinear wall



March 1967 MASAO YOSHIOKA ETAL ,589

LAYERED GURVILINEAR WALL Filed Dec. 18, 1963 F/az F/a-i (PRIOR ART) FIG. 6

INVENTORS MASAO YOSHIOKA KIYOSHI MORI BY WWW fizwrg ATTORNEYS United States Patent 3,308,589 LAYERED CURVILINEAR WALL Masao Yoshioka and Kiyoslii Mori, Kitakyushu, Japan, assignors to Yawata Iron 8: Steel Co., Ltd., Tokyo, Japan, a corporation of Japan Filed Dec. 18, 1963, Ser. No. 331,517 Claims priority, application Japan, Dec. 22, 1962, 37/58,412 1 Claim. (Cl. 52-249) This invention relates generally to methods of building outside winding brick walls for industrial furnaces, and more particularly to a method of building outside winding brick walls for industrial kilns and other refractory structures exposed to high temperature from inside and outside.

The present invention is a method of building outside winding brick walls in building walls of firebricks which can not stand alone on both inside and outside of a cylindrical central iron wall provided in the body of an industrial furnace or any refractory structure exposed to high temperatures of a molten steel or the like from both inside and outside, comprising making out grooves in the firebricks winding the outside of said iron wall and fitting metal rings in said grooves in laying the bricks.

An object of the present invention is to provide a method of building outside winding refractory walls for industrial kilns and other refractory structures exposed to high temperatures from both inside and outside wherein strong outside winding brick walls endurable to the long use can be simply and easily built of firebricks without using any amorphous refractory material and can be re- I paired very simply.

Another object of the present invention is to provide a suction pipe (or an exhaust pipe) to be used for vacuum-degassing a molten steel or the like wherein the outside winding refractory wall is strongly built of firebricks so as to be endurable to the repeated use over a long time against the erosion from both inside and outside by a high temperature molten steel in which the pipe is dipped.

The other objects and substance of the present invention will be able to be completely understood by referring to the following specification and claim and the accompanying drawings.

FIGURE 1 is a sectioned View of a refractory structure (suction or exhaust pipe) built by a conventional method.

FIGURE 2 is a sectioned view of the refractory structure in FIGURE 1 as built by the method of the present invention.

FIGURE 3 is a sectioned view on line A-A in FIG- URE 2.

FIGURE 4 is a perspective view of an outside winding brick in the method of the present invention.

FIGURE 5 is a perspective view of a metal ring in the method of the present invention.

FIGURE 6 is a magnified detailed view of a part of the brick wall built according to the method of the present invention.

There are a considerable number of such conventional industrial kilns and refractory structures as are subjected to high temperatures from both inside and outside. For example, there is a molten steel suction pipe or exhaust pipe for sucking up a molten steel in a ladle into a vacuum-degassing tank in degassing the molten steel. As such suction pipe (or exhaust pipe) comes into contact with the high temperature molten steel on both inside and outside simultaneously, it must be strongly wound with a refractory material on both sides.

Generally, in the case of a furnace or refractory structure of only inside winding bricks, it is possible to build a strong brick wall by using an outside iron wall or an- 3,38,589 Patented Mar. 14, 1967 nular fastening bands. But, in a furnace or refractory structure of outside'winding bricks subjected 'to high temperatures from outside, it has been considered very difficult to build on outside winding brick wall. There has been no building method by which outside winding bricks can be strongly held. An amorphous refractory material has been mostly used to form an outside winding refractory wall.

However, though the part subjected to a high temperature gas flow does not matter so much, since such suction pipe for a molten steel in a vacuum-degassing apparatus as is described above comes into contact with the molten steel from both inside and outside, not only the outside winding formation of the above mentioned amorphous refractory material can not endure the long use therein but also much trouble and time are required to build and v repair it.

For example, in such conventional structure as is illustrated in FIGURE 1, an inside winding brick wall 2 is built inside an iron wall 1 having holding metal fixtures 6 on the periphery, said iron wall 1 is covered with a frame on the outer periphery and a viscous or sludgy refractory material is poured in between the frame and iron wall 1 so as to build an outside winding wall of the amorphous refractory material 7. Therefore, much trouble is required to build it and the selection of the material itself is restricted. For example, generally, a powdery castable material is used as kneaded with water and therefore the life of such material is so short that the loss by melting will reach the holding metal fixtures after a few uses and the outside winding wall will have to be repaired after each use. In the repairing operation, quick cooling just after the use must be avoided and therefore, after the outside winding wall is gradually cooled within a heat-insulated frame, a viscous refractory material is poured in within a covering frame.

As another known conventional example, there is a method of building outside winding brick walls wherein several steps of upward directed flanges are made on the outer periphery of a metal core and bricks are inserted and fixed between the flanges. However, it has defects that, during the operation, the loss by melting will start in the part of the flanges, especially, in the middle portion in contact with a slag and that the firebricks must be in a special form.

The present invention is to eliminate such defects as are mentioned above and is a building method wherein, by using outside winding firebricks having grooves and metal rings to fit in the grooves, a strong outside winding brick wall can be easily built and can be also very simply repaired. Furth-er, according to the present invention, in laying molded outside winding bricks from the lower step to the upper step in turn as an outside winding refractory wall to be in contact with high temperatures of a molten steel or the like, the outside winding refractory wall can be easily, positively and strongly built within a short time and its life can be made longer.

The present invention shall now be explained with reference to the embodiment illustrated in the drawings. In the drawings, 1 is a central iron wall. A projection 14 is fixed to the lower part of the iron wall so that outside winding bricks 3' in the lower step may be supported by the iron wall 1. The other upper outside winding bricks 3 are strongly wound and laid in an outside winding in turn by means of metal rings 4. Such out grooves 5 and 5' as are shown in FIGURE 4 are made in the outside winding bricks 3 and 3' to fit said metal rings 4 in them. The details of the structure of such outside winding brick wall are illustrated as magnified in FIGURE 6. As shown therein, the space between the iron wall 1 and bricks 3 and 3' and also the space around each metal ring 4 are filled with a mortar 10 so that the bricks may be precisely laid and a strong outside winding brick Wall may be built. The inside winding brick wall 2 illustrated in the drawings may be made by any known conventional building method. The spaces 8, 9, and 11 which can not be built of bricks are filled with an amorphous refractory material to protect the iron wall 1. In the drawings, 12 is a flange assembled to be fixed to a degassing tank (not illustrated) by means of bolts 13.

In the outside winding refractory wall by the conventional method shown in FIGURE 1 is formed of an amorphous refractory material 7 and has many holding metal fixtures 6 fixed to the iron wall to prevent the material from dropping. However, it has been usual that the refractory material 7 will gradually decrease from the surface due to erosion by the molten steel, will be finally melted and lost together with the holding metal fixtures and will not be easily repaired.

On the other hand, in the present invention, as described above, the firebricks 3 which are strong against erosion by the molten steel can be used and can be made so small as shown in FIGURE 4 as to reduce deformation by thermal expansion and to be easy to handle.

The above mentioned metal rings 4 may be made of an ordinary soft steel and can be fitted in the cut grooves 5 and 5' of the outside winding bricks 3 so as to positively and strongly combine the upper bricks and lower bricks together. Thus the outside winding bricks 3 can be easily laid from the lower step to the upper step in turn. When the bricks 3 have been eroded to the fitting parts of the metal rings 4, the rings will be melted and lost to be no more. In such case, the remaining outside winding bricks 3 and metal rings 4 can be removed at once and new outside winding bricks 3 can be laid around the iron wall 1 by using separately prepared new metal rings 4.

Our invention has been explained in the above with reference to a limited embodiment. However, this disclosure has been made merely for the purpose of exemplification. It is thus considered that the variation of the construction of the details and the alteration of the combination of the respective parts can be made with- 4 out deviating from the below claimed spirit and scope of the present invention. What is claimed is:

A connecting pipe adapted to extend between a container for vacuum degassing molten metal, especially molten steel, and a body of molten metal, and which is exposed to molten metal on both the outside and inside thereof, said pipe comprising a central cylindrical metal wall, a lining of fire bricks on the inside of said wall, an L-section flange projecting outwardly from said cylindrical wall adjacent the lower end of said wall, a bottom row of fire bricks each having a groove in an inside lower portion thereof and being supported on the Lsection flange at the outside surface of the iron wall, each of the bricks in said bottom row of bricks having a groove in the upper surface thereof aligned with the grooves in the other bricks, mortar fixing the bottom bricks to the flange, a bottom metal ring in the upper grooves of the bottom bricks, further bricks in circular rows one on top of the other up the outside of said wall, each further brick having grooves in the upper and lower surfaces thereof aligned with the corresponding grooves in the other bricks, the lower groove in the bottom row of further bricks fitting over the bottom metal ring, further metal rings in each circular groove defined between the circular rows of further bricks, and mortar fixing the further bricks and the further metal rings to each other.

References Cited by the Examiner UNITED STATES PATENTS 204,867 6/1878 Wight 52-445 637,500 11/1899 Camp 52 -24s 1,232,607 7/1917 Ridgeway 52-586 2,417,348 3/1947 Carter 52268 2,460,052 1/1949 Werner 52 249 FRANK L. ABBOTT, Primary Examiner.

J. L. RIDGILL, Assistant Examiner. 

